Journal
PROTIST
Volume 162, Issue 5, Pages 762-773Publisher
ELSEVIER GMBH
DOI: 10.1016/j.protis.2011.05.002
Keywords
Novel eukaryotic lineage; microaerophilic eukaryotes; orphan lineage; Breviata
Categories
Funding
- NSF [043115]
- ATCC
- NSF RUI Systematics [0919152]
- Direct For Biological Sciences
- Division Of Environmental Biology [0919152] Funding Source: National Science Foundation
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While a large number of aerobic free-living protists have been described within the last decade, the number of new anaerobic or microaerophilic microbial eukaryotic taxa has lagged behind. Here we describe a microaerophilic genus and species of amoeboflagellate isolated from a near-shore marine site off the coast at Plymouth, Massachusetts: Subulatomonas tetraspora nov. gen. nov. sp. This taxon is closely related to Breviata anathema based on both microscopical features and phylogenetic analyses of sequences of three genes: SSU-rDNA, actin, and alpha-tubulin. However, Subulatomonas tetraspora nov. gen. nov. sp. and B. anathema are morphologically distinctive, differ by 14.9% at their SSU-rDNA locus, and were isolated from marine and 'slightly brackish' environments, respectively. Phylogenetic analyses of these two taxa plus closely related sequences from environmental surveys provide support for a novel clade of eukaryotes that is distinct from the major clades including the Opisthokonta, Excavata, Amoebozoa and 'SAR' (Stramenopile, Alveolate, Rhizaria). (C) 2011 Elsevier GmbH. All rights reserved.
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